Increase the intensity! Application of RFH Nanosecond Solid-state Laser in Laser Shock Strengthening

As we all know, a large number of metal materials are used in aerospace, automobile industry, ocean-going ships, molds, petrochemicals, medical and health and other fields. Workpieces made of these metal materials, especially key parts such as engine blades, blisks, load-bearing beams, etc. High temperature, high pressure, high speed, high salt, high acid and other harsh operating environments are prone to metal fatigue, corrosion, friction, wear, etc., thus affecting the life and safety of the workpiece.

With the continuous improvement of the performance indicators of key parts in various fields and the continuous emergence of new materials, traditional forging, casting and other traditional technologies have been unable to meet the needs of long life and high stability in harsh environments. Because most of the failure of metal materials occurs on the surface of the material, which has attracted great attention of material workers, the technology of material surface strengthening has been developed rapidly. Through their research, they found that the use of laser shock strengthening technology to act on the surface of the material can improve the overall strength and toughness of the metal material.

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Laser shock peening technology (Laser Shocking Peening, LSP), also known as laser shot peening technology, its working principle is: the surface of the workpiece to be treated is covered with an opaque absorption layer and a confinement layer, and the laser is absorbed by the absorption layer to generate plasma. Under the confinement of the layer, the explosion of the plasma generates a strong shock wave on the surface of the material and propagates into the material. After the laser action is over, due to the reaction of the materials around the impact area, the mechanical effect is that the surface of the material obtains a higher residual compressive stress. Participating in the compressive stress can reduce the tensile stress level of the alternating load, thereby improving the fatigue resistance of the material. In addition, laser shock strengthening can also be applied to the fatigue recovery of metal materials, suitable for aero-engine blades, aircraft skins, rivets and other components; automotive engine pistons, cylinders and other components and welds of special pipes, etc. It is widely used and has non-direct contact , no heat-affected zone, strong controllability and outstanding strengthening effect.

Since laser shock strengthening is often achieved by lasers with high power density (4~10GW/cm2) and short pulses (10-30ns), you can choose the industrial-grade nanosecond solid-state laser developed and designed by Nanofei Optoelectronics, which outputs 355nm ultraviolet light. Laser, the output power is greater than 30W, the pulse width is small (less than 25ns@100kHZ), the heat affected zone is small, the workpiece deformation is small, the beam quality is excellent (M2<1.2), the power density is high, and the repetition frequency is from single pulse to 500kHz. Different types of laser surface strengthening needs, match the power density, action time and action mode of the laser beam and the surface of the material, and when using laser shock strengthening, the size of the laser spot and the focus position can be accurately controlled, and this process can be flexibly used to deal with some The parts that are difficult or impossible to handle by ordinary technology. In addition, the integrated design is especially suitable for industrial production environments, which can meet 7*24h uninterrupted work and maximize economic benefits.

Due to the very important practical significance of laser strengthening technology, the market prospect is very broad. According to a market research report, in the metal surface mechanical treatment market in my country in 2020, the market size of laser strengthening will reach 49 billion yuan. However, this advanced technology is currently mainly controlled by countries with outstanding advantages in advanced manufacturing fields such as Europe and the United States, while my country is still in the early stage of development. During the "14th Five-Year Plan" period, laser-enhanced equipment was listed as one of the high-end equipment for national key development. The strong market demand and the guidance of national policies are bound to further promote the localization of laser-enhanced equipment. In this regard, the RFH industrial-grade nanosecond solid-state laser has shown a good prospect of domestic substitution. In the future, it will continue to strengthen the key application technology research of advanced surface strengthening and manufacturing technology, and fully assist domestic laser strengthening equipment to achieve import substitution.